Leptopentacta H. L. Clark 1938

• Main Authors: Mezali, Karim, Thandar, Ahmed S., Khodja, Ihcene
• Format: Text
• Language: unknown
• Published: Zenodo 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Echinodermata; Holothuroidea; Dendrochirotida; Cucumariidae; Leptopentacta; Pacific; Buttons; North West Atlantic
• Online Access: https://dx.doi.org/10.5281/zenodo.4537685; https://zenodo.org/record/4537685

Key to the genera Leptopentacta (s.s.) and Paraleptopentacta n. gen and their species 1. Calcareous ring with posteriorly forked radial plates always in combination with large multi-layered, reticulated plates or lenslike bodies as major body wall deposits; Indo-Pacific forms...................................... Leptopentacta ... 2 - Calcareous ring usually with unforked radial plates in combination with usually large unreticulated, smooth plates made up of a single layer of calcareous material, as major body wall deposits; Mediterranean and North-West Atlantic forms...................................................................................... Paraleptopentacta n. gen. ... 7 2. External layer of deposits exclude baskets or rosettes of any form............................................... 3 - External layer of deposits include baskets or rosettes or both................................................... 4 3. Tube feet rigid, non-retractile; only small knobbed buttons present in addition to reticulated plates......... L. bacilliformis - Tube feet retractile; knobbed buttons present; plates complex with reticulated bars (species known only from juveniles)................................................................................................... L. nina 4. External layer of ossicles as rosettes developed from baskets, complete baskets often present in addition to rosettes, perhaps in juveniles only............................................................................... L. imbricata - External layer of ossicles only as baskets................................................................... 5 5. Baskets deep, cup-like; plates as lens-like, reticulated bodies; smaller, smooth plates and knobbed buttons with large holes also present........................................................................................ L. grisea - Baskets also deep, cup-like; large plates reticulated but not appearing as lenticular or lens-like bodies; other plates also present but also non-lenticular; buttons present.................................................................... 6 6. Some baskets rosette-like; buttons knobbed with small holes; reticulate plates never with a protruding spine..................................................................................................... L. punctabipedia - Baskets deep, cup-like; sometimes both baskets and plates provided with a protruding spine................. L. panamica 7. Plates smooth, simple, multilocular, of several sizes, rarely imbricating; baskets numerous, variable.................... 8 - Plates of various forms, rarely one or two reticulate; baskets flat, with trabeculae, margins slightly knobbed...... P. cucumis 8. Baskets large, with numerous marginal projections, buttons absent from body wall; large plates smooth................. 9 - Baskets tiny but also with numerous projections; buttons also tiny, knobbed, holes minute; large plates knobbed..................................................................................................... P. djakonovi 9. Plates smooth, imbricating; baskets with tiny projections and sometimes multilocular base; plates of various sizes but never narrow and elongate, holes large; rosettes absent..................................................... P. elongata - Plates not imbricating, smooth, of various sizes, often narrow with usually two series of small holes; baskets cup-like, with numerous projections in various directions; rosettes also present............................... P. tergestina n. comb. : Published as part of Mezali, Karim, Thandar, Ahmed S. & Khodja, Ihcene, 2020, Paraleptopentacta, a new Mediterranean and north-west Atlantic sea cucumber genus, with the first record of P. tergestina n. comb. (Echinodermata Dendrochirotida: Cucumariidae) from the north-western Algerian coast, pp. 199-210 in Zootaxa 4860 (2) on page 205, DOI: 10.11646/zootaxa.4860.2.3, http://zenodo.org/record/4537555