The embryology and metamorphosis of the Macroura

Brooks, William; Herrick, Francis H.

doi:10.5962/bhl.title.2060

Cited by 15 publications

(16 citation statements)

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“…Two pairs of midgut caeca (described as the anterior and posterior digestive gland rudiments by Anderson, '82) are present at the anterior end of the midgut in the protozoea of P. setiferus and in the embryonized developmental stages of other decapods examined. Paired anterior midgut caeca of recently hatched leptostracans have been reported (as cephalic caeca) to be unique among malacostracans (Schram,'84), but similar paired anterior caeca have been described in larval, and in some cases postlarval, stages of Alpheus, Astacus, Homarus, Pagurus, and Cancer (Brooks and Herrick, 1891;Factor, '81;Manton, '34; Thompson, ' 03; Trask, '74), as well as in Pe-naeus (present study). In some species these caeca are absorbed during development, whereas in other species they develop into either the anterior diverticulum or anterior caeca of the adults.…”

Section: Ontogeny In Decapodsmentioning

confidence: 97%

“…In P. setiferus, as in the caridean decapods Alpheus, Crangon, and Palaemonetes (Brooks and Herrick, 1891;Regnault, '72;LeRoux, '71a,b), there is no gastric mill present during any larval stage. However, these carideans also lack a gastric mill in the adult.…”

Section: Ontogeny In Decapodsmentioning

confidence: 99%

“…Except for the development of lobes on the lateral caeca, the anterior and lateral caeca remain relatively unchanged during larval development in Penaeus, Alpheus, Pagurus, and Cancer (Brooks and Herrick, 1891;Thompson, '03;Trask, '74). In these genera, ramification of the lateral caeca into small-diameter tubules occurs during early postlarval development (and in Penaeus is not completed until several weeks after metamorphosis).…”

Section: Ontogeny In Decapodsmentioning

confidence: 99%

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Ontogeny of Kinematics in the Gut of the White Shrimp Penaeus setiferus (Decapoda: Penaeidae)

Lovett¹,

Felder²

1990

Journal of Crustacean Biology

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Ontogeny of the gut in Penaeus setiferus was investigated by reconstruction of serial sections examined by light microscopy. Development of the gut into the adult form is protracted over several weeks beyond metamorphosis in steps that may be directly related to the unique postlarval life history of Penaeus. The gastric mill is lacking in larval stages of P. setiferus. In protozoeal stages Z,-Z3, the pyloric ampullae are blind sacs that do not communicate with the midgut. The gland filter first appears in mysis stage M,. The gastric mill in early postlarval (PL) stages consists of poorly chitinized lobes with flexible setae. By PLzl the ossicles of the gastric mill are rigid and setae are replaced by spine-like denticles, but even by PL,, the gastric mill is neither as massive nor heavily chitinized as in adults. During the mysis stages and early PL stages, the hepatopancreas communicates freely with both the foregut and the midgut trunk. By PL,, the hepatopancreatic ducts are essentially isolated from the remainder of the midgut by foregut ossicles.The midgut in Z, consists of two pairs of simple caeca and the midgut trunk. During larval growth, each of the lateral midgut caeca develops into a number of lobes. After metamorphosis these lobes begin to ramify into small-diameter tubules, and by PL,, have completely ramified into the hepatopancreas of adults.From MI to PL,, the anterior midgut caeca decrease in absolute size and become a single anterior diverticulum. The posterior midgut diverticulum first appears in PL,, as a simple sac and thereafter increases in size and complexity.After hatching in the open sea over the continental shelf, larvae of Penaeus setiferus pass through five nonfeeding naupliar stages (N1-N5), three protozoeal stages (Zl-Z3), and three mysis stages (M1-M3); they then metamorphose into a decapodid, the first postlarval stage (PL,) (Heegaard, '53; McVey and Fox, '83; Pearson, '39). In many decapod species, such as crabs and lobsters, the metamorphic molt is accompanied by an abrupt change in habit from planktonic to benthic. However, in Penueus this change is protracted over a 2 week period and occurs gradually while the early postlarvae migrate inshore toward estuarine nursery grounds (PBrez-Farfante, '69, and citations therein).While in most decapods the basic adult form of both external and internal structures (exclusive of sexual organs and secondary sexual characteristics) is attained at metamorphosis or in the developmental stages immediately preceding or following molt to the decapodid stage, in penaeids both habit and structure appear to transform less abruptly (Felder et al., '85). Postlarval development was examined in Penaeus schmitti by Perez PBrez and Ros ('75) and in Penaeus plebejus by Dakin ('38); in both species the adult form of a number of external features is not attained soon after metamorphosis, but rather is protracted over a period of several weeks.Ontogenetic change in the external morphology, including mouth parts, of P. setiferus larvae has been stud...

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Section: Ontogeny In Decapodsmentioning

confidence: 97%

Section: Ontogeny In Decapodsmentioning

confidence: 99%

Section: Ontogeny In Decapodsmentioning

confidence: 99%

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Ontogeny of Kinematics in the Gut of the White Shrimp Penaeus setiferus (Decapoda: Penaeidae)

Lovett¹,

Felder²

1990

Journal of Crustacean Biology

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“…Snapping shrimp of the family Alpheidae (Decapoda, Caridea) form a water jet by rapid closure of their snapper claw [1] . One side of the claw is the dactyl while the other side is the propus [2] . The dactyl possesses a stopper-like tooth (the plunger) which fits into a socket of the propus.…”

Section: Introductionmentioning

confidence: 99%

Vortex Formation with a Snapping Shrimp Claw

et al. 2013

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Snapping shrimp use one oversized claw to generate a cavitating high speed water jet for hunting, defence and communication. This work is an experimental investigation about the jet generation. Snapping shrimp (Alpheus-bellulus) were investigated by using an enlarged transparent model reproducing the closure of the snapper claw. Flow inside the model was studied using both High-Speed Particle Image Velocimetry (HS-PIV) and flow visualization. During claw closure a channel-like cavity was formed between the plunger and the socket featuring a nozzle-type contour at the orifice. Closing the mechanism led to the formation of a leading vortex ring with a dimensionless formation number of approximate ΔT*≈4. This indicates that the claw might work at maximum efficiency, i.e. maximum vortex strength was achieved by a minimum of fluid volume ejected. The subsequent vortex cavitation with the formation of an axial reentrant jet is a reasonable explanation for the large penetration depth of the water jet. That snapping shrimp can reach with their claw-induced flow. Within such a cavitation process, an axial reentrant jet is generated in the hollow cylindrical core of the cavitated vortex that pushes the front further downstream and whose length can exceed the initial jet penetration depth by several times.

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“…It is known that, in nature, members of this species are typically found in breeding pairs (Brooks & Herrick 1891;Johnson 1977), and that male gamete transfer occurs after the female's molt in a series of continuous, successive breeding cycles (Young 1979;Zhang et al 1998;Gregati et al 2010). Balss (1944) and Bauer (1986) have argued that the process of sperm transfer in this species is similar to that of members of the Caridea, in which the male deposits a simple sperm mass on the sternum of the female and fertilization occurs externally during the extrusion of eggs.…”

mentioning

confidence: 99%

Functional morphology of the reproductive system and sperm transfer inStenopus hispidus(Crustacea: Decapoda: Stenopodidea), and their relation to the mating system

Gregati

Fransozo

Greco

et al. 2014

Invertebrate Biology

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The morphology of the reproductive system of a stenopodidean decapod is described here for the first time, with an interpretation of the sperm transfer process. Pairs of adults of Stenopus hispidus were maintained under laboratory conditions to observe reproductive cycles. Mating behavior and sperm transfer were video-recorded for analysis. After copulation, the shrimps were anesthetized and dissected to record the shape and location of the gonads, and pleopod morphology was described and illustrated. The reproductive systems (RS), thoracic sterna, and male and female genitalia were observed by scanning electron microscopy. The male reproductive system was restricted to the cephalothorax and was highly reduced compared with that of other decapods. Only the first pair of pleopods may be involved in the sperm transfer process; there was no appendix masculina on the second pair of pleopods as in many other decapods. The ovaries of prespawning females occupied much of the cephalothorax and reached to the 3 rd abdominal segment. The oviducts were short and simple, without structures for sperm storage. We conclude that the male deposits a simple spermatophoric mass onto the posteroventral surface of the female and fertilization occurs externally as mature oocytes are subsequently spawned. This mode of sperm transfer and egg fertilization is ancestral within the decapod suborder Pleocyemata. As in some other animals, the relatively small size of the testes in S. hispidus may be related to the monogamous mating system, which may minimize selection for a large volume of sperm production.

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The embryology and metamorphosis of the Macroura

Cited by 15 publications

References 1 publication

Ontogeny of Kinematics in the Gut of the White Shrimp Penaeus setiferus (Decapoda: Penaeidae)

Ontogeny of Kinematics in the Gut of the White Shrimp Penaeus setiferus (Decapoda: Penaeidae)

Vortex Formation with a Snapping Shrimp Claw

Functional morphology of the reproductive system and sperm transfer inStenopus hispidus(Crustacea: Decapoda: Stenopodidea), and their relation to the mating system

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