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A New Species of Crangonid Shrimp of the Genus Philocheras (Crustacea: Decapoda: Caridea) from Hawai'i
| Content Provider | Semantic Scholar |
|---|---|
| Author | Komai, Tomoyuki |
| Copyright Year | 2001 |
| Abstract | Philocheras breviflagella, a new species of crangonid shrimp, is described and illustrated on the basis of a single ovigerous female collected from O'ahu, Hawai'i, at subtidal depth. The new species is most similar to P. sabsechota (Kemp, 1911) known with certainty only from the Andaman Islands, eastern Indian Ocean. It differs from P. sabsechota in several features, including the much narrower rostrum, the unarmed second lateral carina of the carapace, and the truncate posterior margin of the uropodal exopod. Other differences include the shorter fingers (each with an elongate unguis) of the second pereopod, and medially notched posterodorsal margins of the second and fourth abdominal somites. The new species is the first representative of the genus found to occur in the central Pacific. THE GENUS Philocheras Stebbing, 1900, is the most speciose among the Crangonidae, including nearly 50 species worldwide (de Man 1920, Holthuis 1951, 1961, Yaldwyn 1960, 1971, Zarenkov 1968, Crosnier 1971, Fujino and Miyake 1971, Dardeau 1980, Chace 1984, Wicksten 1989, Burukovsky 1990a,b, Bruce 1994, De Grave 2000, Kim and Hayashi 2000). Although Kemp (1911) synonymized Philocheras with Pontophilus Leach, 1817, the genus was revived on the basis of the laterally unarmed rostrum, the absence of a postorbital suture on the carapace, and the absence of an exopod on the first pereopod (Chace 1984). Christoffersen (1988) showed that Philocheras is a clade, characterized by one autapomorphy (the antennular stylocerite is transversely oblong) and one homoplasy (the exopod is absent from the first pereopod). Philocheras is well represented in the Indo-West Pacific by 19 species, but there has been no record of the genus from the central Pacific, including Hawai'i. 1 Manuscript accepted 7 February 2001. 2 Natural History Museum and Institute, Chiba, 955-2 Aoba-cho, Chuo-ku, Chiba 260-8682, Japan (E-mail: komai@chiba-muse.or.jp). Pacific Science (2001), vol. 55, no. 4:419-427 © 2001 by University of Hawai'i Press All rights reserved During an ongoing study of Crangonidae in the Indo-Pacific, a small ovigerous specimen from O'ahu, Hawai'i, was made available for study by Dr. P. K L. Ng of the National University of Singapore. Detailed examination has shown that this specimen represents a distinct undescribed species of Philocheras. Although only a single specimen was available for examination, its distinctiveness has led me to describe it as a new species, P. breviflagella. This new species represents the first record of Philocheras in the central Pacific. The holotype is deposited in the Raffles Museum of Biodiversity Research, National University of Singapore (ZRC). The abbreviation "cl" indicates postorbital carapace length. The drawings were made with the aid of a drawing tube mounted on a stereomicroscope (Leica MZ8). |
| Starting Page | 419 |
| Ending Page | 427 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.1353/psc.2001.0031 |
| Volume Number | 55 |
| Alternate Webpage(s) | http://scholarspace.manoa.hawaii.edu/bitstream/10125/2509/1/v55n4-419-427.pdf |
| Alternate Webpage(s) | https://doi.org/10.1353/psc.2001.0031 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
