When heads are not homologous: the coronae of larval and adult collothecid rotifers (Rotifera: Monogononta: Collothecaceae)

Hochberg, Rick; Yang, Hui Ying; Hochberg, Adele; Walsh, Elizabeth J.; Wallace, Robert L.

doi:10.1007/s10750-018-3760-3

Cited by 6 publications

(12 citation statements)

References 32 publications

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“…Ventrally, there were some light SLIR regions proximal to the neurite ring (data not shown), but these regions lacked DAPI staining and so appeared to correspond to the ciliary cushions of rotifer coronae (e.g., see Hochberg et al, 2019). Neither the anterior pair of neurites (AP an ) nor the ring were observed in adults, although some small patches of immunoreactivity (IR) were present around the infundibulum that may indicate their presence ( Figure 2).…”

Section: F I G U R Ementioning

confidence: 97%

“…However, observations of several species of Collothecidae and Atrochidae, together forming the order Collothecaceae, have shown that this life stage goes through a dramatic metamorphosis. This transformation leads to a complete replacement of the larval head with a new adult head, called the infundibulum (Hochberg & Hochberg, 2015, 2017; Hochberg et al., 2017, 2019; Kutikova, 1995). Larvae do not feed but appear to survive on limited maternal reserves (Wallace, 1993; Young et al., 2019) and must, therefore, find a suitable substrate before expending their energy (Wallace, 1980).…”

Section: Introductionmentioning

confidence: 99%

“…An evolutionary adaptation to counteract lower feeding efficiency in the sessile flosculariid rotifers may be the larger, more ornate corona compared to their planktonic and benthic counterparts (reviewed in Wallace et al., 2006). By contrast, in collothecid rotifers the head has taken on an entirely unique shape (Hochberg et al., 2019). In these species, the larval head is replaced by the adult infundibulum at metamorphosis.…”

Section: Introductionmentioning

confidence: 99%

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Remodeling of the nervous system of the indirectly developing rotifer Cupelopagis vorax (Gnesiotrocha, Collothecaceae)

Preza

Walsh

Hochberg

2020

Invertebrate Biology

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Phylum Rotifera originally consisted of three clades of microscopic aquatic invertebrates, Seisonidea, Bdelloidea, and Monogononta, which comprise over 2,000 marine, freshwater, and semi-terrestrial species (Segers, 2007); more recently, the parasitic acanthocephalans have been subsumed within the phylum (Herlyn et al., 2003; Sielaff et al., 2015). The traditionally recognized rotifers are characterized by a ciliated corona, a syncytial body wall, and a mastax, which is a specialized pharyngeal organ with sclerotized jaws called trophi. Most species are planktonic, benthic, or epiphytic and use their ciliated corona as the primary means of locomotion and food collection. As ciliary feeders, many rotifers consume suspended microalgae, bacteria, or detritus, whereas others are occasional or

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Section: F I G U R Ementioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Remodeling of the nervous system of the indirectly developing rotifer Cupelopagis vorax (Gnesiotrocha, Collothecaceae)

Preza

Walsh

Hochberg

2020

Invertebrate Biology

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“…Although less attention has been given to sessile rotifers than their planktonic counterparts, research on these species has a rich tradition. Investigations have focused on their taxonomy and diversity (Meksuwan et al 2011;Sarma et al 2020;Segers & Shiel 2008), genetics (Brown & Walsh 2019;Kordbacheh et al 2018;Meksuwan et al 2015), larval development , life history (Kutikova 1995;Tiefenbacher 1972), substratum selection (Edmondson 1944;Wallace 1977;Wallace & Edmondson 1986;Young et al 2019), anatomy (Franch 2021;Hochberg 2014;Hochberg et al 2019), and ecology (Jiménez-Santos et al 2019a;Jiménez-Santos et al 2019b;Wallace 1980;Wallace & Edmondson 1986). But besides difficulties in collecting and processing live specimens for study (Wallace et al 2006), research on sessile rotifers is hampered by the lack of comprehensive understanding of their taxonomy and phylogeny.…”

Section: Introductionmentioning

confidence: 99%

The dorsal plate is a critical feature in the reassessment of the rotiferan genus Ptygura (Monogononta; Gnesiotrocha; Flosculariidae)

FRANCH,

MEKSUWAN,

WALLACE

2024

Zootaxa

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All species of Flosculariidae (Rotifera; Monogononta; Gnesiotrocha; Flosculariaceae) possess a flexible integument; they are termed illoricate. But species of four genera (Beauchampia, Floscularia, Limnias, and Ptygura) possess a distinctive hardened region on the dorsal side of their anterior end, which unfortunately has received little attention beyond the species level. In our work we study the ultrastructure of these hardened regions. In Beauchampia, Limnias, and some species of Ptygura the hardened zone takes the form of a dorsal plate (hereafter DP) with or without additional protruding processes. The DP has the shape of a ~50 µm diameter disc enfolding the anterior dorsal region of the animal, with a perimetral inward fold, smooth surface, and pores. The DP of Limnias ceratophylli shows three main ultrastructural differences from the rest of the body: (1) type of glycocalyx, (2) absence of small mounds on its surface, and (3) presence of broad cisternae at the base of the pores. In Floscularia and some Ptygura the hardened structures are reduced to a pair of dorsal projections protecting the dorsal antenna: i.e., lacking a full DP. These structures deserve attention because their adaptive importance has not been studied. Here we augment those observations with other characters: i.e., presence/absence of a birefringent body in late-stage embryos and morphology of their trophi and corona. Our goal was to provide information to help develop better taxonomy, as well as advance our understanding of the evolution of sessile taxa in general and of the potentially polyphyletic Ptygura genus in particular.

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“…A striking feature of rotifers, and the characteristic from which their names is derived, is the corona. Hochberg et al (2019) undertook an in-depth analysis of collothecid corona and posited that it is not homologous to the corona of ploimid rotifers. Rather during metamorphosis from the larval stage to the adult, the corona is replaced by the infundibulum, which is derived from the larval foregut.…”

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confidence: 99%

Preface: Crossing disciplinary borders in rotifer research

Walsh

Wallace

2019

Hydrobiologia

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In August of 1974 at the 19th Congress of the Societas Internationalis Limnologiae (Winnipeg, Canada), a small group of aquatic scientists led by Dr. Agnes Ruttner-Kolisko proposed an innovative concept: a special symposium dedicated solely to rotifer research should be held. Two years later, in late September, Agnes hosted the first International Rotifer Symposium (IRS) at the research station located on Lunzer Untersee (Lunz am See, Austria). Every 3 years since that inaugural meeting, the ''rotifer family'' has convened somewhere in the world to share research on all topics related to rotifer biology. Accordingly, the IRS comprises scientists who devote most, if not all, of their time to research on the biology, ecology, systematics, and evolution of rotifers, or who find rotifers to be useful model systems to explore other interesting lines of inquiry. Yet these meetings do more than just share research, they inspire others to pursue a deeper appreciation of these remarkable small metazoans. The 15th IRS was held on the campus of The University of Texas at El Paso, Texas (UTEP) from the 3rd to 9th of June 2018. Attendees included just over 100 participants and accompanying persons from 17 countries (Fig. 1), with the highest representation from the USA (38), Mexico (26), and Europe (15).

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When heads are not homologous: the coronae of larval and adult collothecid rotifers (Rotifera: Monogononta: Collothecaceae)

Cited by 6 publications

References 32 publications

Remodeling of the nervous system of the indirectly developing rotifer Cupelopagis vorax (Gnesiotrocha, Collothecaceae)

Remodeling of the nervous system of the indirectly developing rotifer Cupelopagis vorax (Gnesiotrocha, Collothecaceae)

The dorsal plate is a critical feature in the reassessment of the rotiferan genus Ptygura (Monogononta; Gnesiotrocha; Flosculariidae)

Preface: Crossing disciplinary borders in rotifer research

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