Membras Bonaparte. The 1836
Key to the Genus Membras Bonaparte 1A. Rostral sensory system 4+2, without four large pits at margin of frontal bones; scales around body 20–27, modally 22................................................................................................. M. gilberti 1B. Rostral sensory system 4+2+4, w...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Text |
| Language: | unknown |
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Zenodo
2020
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| Online Access: | https://dx.doi.org/10.5281/zenodo.4509808 https://zenodo.org/record/4509808 |
| Summary: | Key to the Genus Membras Bonaparte 1A. Rostral sensory system 4+2, without four large pits at margin of frontal bones; scales around body 20–27, modally 22................................................................................................. M. gilberti 1B. Rostral sensory system 4+2+4, with four large deep pits at margin of frontal bones (in largest specimens the two intermediate pits may fuse with the two posterior pits); scales around body 13–19, modally 16................................... 2 2A. Anus located just anterior to origin of anal fin; tips of pelvic fins not reaching anterior margin of vent; predorsal scales 21–26, modally 23–24; posterior margins of scales laciniate................................................ M. martinica 2B. Anus positioned closer to base of pelvic fin than to origin of anal fin; tips of pelvic fins reaching or extending beyond anterior margin of vent; predorsal scales 16–21, modally 19–20; posterior margins of scales smooth or laciniate................ 3 3A Posterior margins of predorsal and lateral scales strongly laciniate............................................... 4 3B Posterior margins of predorsal and lateral scales smooth or irregular............................................. 5 4A Lateral scales 38–39; predorsal scales 16–18, modally 18; length of spinous dorsal fin 6.4–6.9% SL, mean = 6.8%; least depth of caudal peduncle greater than 9.2–9.5% SL, mean = 9.4%........................................... M. argentea 4B. Lateral scales more than 40; predorsal scales 20–21, modally 21; length of spinous dorsal fin 8.8–9.0% SL, mean = 8.8%; least depth of caudal peduncle 7.4–8.6% SL, mean = 8.2%.......................................... M. procera sp. nov. 5A. Precaudal vertebrae 17–18; pre-anal-fin length 6.3–6.4% SL, mean = 63.6%; orbit diameter 6.5–6.7% SL, mean = 6.6%; lateral stripe becomes diffuse at base of caudal fin, lacking a distinctive mark.................................. M. dissimilis 5B. Precaudal vertebrae 14–16, modally 15; pre-anal-fin length 5.6–6.2% SL, mean = 6.0%; orbit diameter 6.8–8.5% SL, mean = 7.7%; lateral stripe ends distinctly before hypural base there can be a diffuse spot or crescent mark present...............6 6A. Least depth of caudal peduncle 8.5–10.5% SL, mean = 9.7%; body depth 15.7–18.1% SL, mean = 16.9%; total gill rakers, first arch 15–18, modally 16–17....................................................................... M. analis 6B. Least depth of caudal peduncle 6.7–8.5% SL, mean = 7.7%; body depth 13.5–15.9% SL, mean = 14.8%; total gill rakers, first arch 16–20, modally 18 or 19............................................................ M. pygmaea sp. nov. : Published as part of Chernoff, Barry, Machado-Allison, Antonio, Escobedo, Jennifer, Freiburger, Michael, Henderson, Elijah, Hennessy, Andrew, Kohn, Grace, Neri, Nola, Parikh, Aashni, Scobell, Sophie, Silverstone, Benjamin & Young, Emily, 2020, Two new miniature silverside fishes of the genus Membras Bonaparte (Atheriniformes, Atherinopsidae) from the Tropical North Atlantic Ocean, pp. 191-202 in Zootaxa 4852 (2) on page 194, DOI: 10.11646/zootaxa.4852.2.4, http://zenodo.org/record/4409798 |
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