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Lepidurus
Classification
Phylum:
Arthropoda
Subphylum:
Crustacea (superclass)
Class:
Branchiopoda
Subclass:
Calmanostraca
Order:
Notostraca
Family:
Triopsidae
Formal Genus Name and Reference:
Lepidurus LEACH, 1819 (p. 539)
Type Species:
*Apus productus BOSC, 1802, OD
Images
(Click to enlarge in a new window)
Fig. 44,7. L. lynchi Linder, Rec., USA, telson, body rings and supra-anal plate, X8.5 (71). -- Fig. 44,2. L. apus (Linné), Rec., cosmop., dorsal view, X1.5 (74). [Fossil species include the following forms.] -- Fig. 44,8. L. stormbergensis HAUGHTON, distinguished by pointed or well-rounded supra-anal plate with well-marked mediodorsal keel (50), Trias. (Stormberg Series), S.Afr.; supra-anal plate and caudal filaments, X4 (50). -- Fig. 44,5,6. L. arcticus (PALLAS), characterized by very small supra-anal plate (74); 5, Pleist.; ?(female) telson and supra-anal plate from Isle of Man, X50 (162); 6a,b, Pleist.-Rec., Eng., and circumpolar, Rec. (femails) and (maile) telson and supra-anal plate, X50 (74). -- -Fig. 44,1. L. daja CHERNYSHEV, with wide, tongue-shaped supra-anal plate (25), L.Cret., Turkestan (Kelmensk Mts.); supra-anal plate and caudal filaments, X2 (25). -- Fig. 44,3. L. schewija CHERNYSHEV, with supra-anal plate larger than telson and constricted in anterior part while enlarged near middle (25), L.Cret., Turkestan (Kelmensk Mts.); supra-anal plate and caudal filaments, X1.5 (25). -- Fig. 44,4. L. kuenga CHERNYSHEV, with very small telson and acutely triangular supra-anal plate equal in length to telson (25), L.Cret., Turkestan (Kelmensk Mts.); supra-anal plate and telson, X6 (25).
Synonyms
Bilobus, Prolepidurus
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Trias.
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Carapace very large, leaving only few somites exposed; last somite (telson) produced as thin, flat, supra-anal plate between caudal filaments. First pair of legs with comparatively short endites; never more than 8 apodal somites.
References
Museum or Author Information
Classification
Phylum:
Arthropoda
Subphylum:
Crustacea (superclass)
Class:
Branchiopoda
Subclass:
Calmanostraca
Order:
Notostraca
Family:
Triopsidae
Formal Genus Name and Reference:
Lepidurus LEACH, 1819 (p. 539)
Type Species:
*Apus productus BOSC, 1802, OD
Images
(Click to enlarge in a new window)
Fig. 44,7. L. lynchi Linder, Rec., USA, telson, body rings and supra-anal plate, X8.5 (71). -- Fig. 44,2. L. apus (Linné), Rec., cosmop., dorsal view, X1.5 (74). [Fossil species include the following forms.] -- Fig. 44,8. L. stormbergensis HAUGHTON, distinguished by pointed or well-rounded supra-anal plate with well-marked mediodorsal keel (50), Trias. (Stormberg Series), S.Afr.; supra-anal plate and caudal filaments, X4 (50). -- Fig. 44,5,6. L. arcticus (PALLAS), characterized by very small supra-anal plate (74); 5, Pleist.; ?(female) telson and supra-anal plate from Isle of Man, X50 (162); 6a,b, Pleist.-Rec., Eng., and circumpolar, Rec. (femails) and (maile) telson and supra-anal plate, X50 (74). -- -Fig. 44,1. L. daja CHERNYSHEV, with wide, tongue-shaped supra-anal plate (25), L.Cret., Turkestan (Kelmensk Mts.); supra-anal plate and caudal filaments, X2 (25). -- Fig. 44,3. L. schewija CHERNYSHEV, with supra-anal plate larger than telson and constricted in anterior part while enlarged near middle (25), L.Cret., Turkestan (Kelmensk Mts.); supra-anal plate and caudal filaments, X1.5 (25). -- Fig. 44,4. L. kuenga CHERNYSHEV, with very small telson and acutely triangular supra-anal plate equal in length to telson (25), L.Cret., Turkestan (Kelmensk Mts.); supra-anal plate and telson, X6 (25).
Synonyms
Bilobus, Prolepidurus
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Trias.
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Carapace very large, leaving only few somites exposed; last somite (telson) produced as thin, flat, supra-anal plate between caudal filaments. First pair of legs with comparatively short endites; never more than 8 apodal somites.