Asterocheres intermedius Hansen 1923
Asterocheres intermedius (Hansen, 1923) Ascomyzon intermedium Hansen 1923: 6. Asterocheres intermedius: Stock 1966 b: 152; Johnsson 1998: 91. Material examined. Holotype Ψ (ZMUC. CRU- 6873 / 8357) collected during the “Danish Ingolf Expedition” in Davis Strait, Station 25 (63 º 30 ΄N, 54 º 25 ΄W), a...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2009
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| Online Access: | https://zenodo.org/record/6221574 https://doi.org/10.5281/zenodo.6221574 |
| Summary: | Asterocheres intermedius (Hansen, 1923) Ascomyzon intermedium Hansen 1923: 6. Asterocheres intermedius: Stock 1966 b: 152; Johnsson 1998: 91. Material examined. Holotype Ψ (ZMUC. CRU- 6873 / 8357) collected during the “Danish Ingolf Expedition” in Davis Strait, Station 25 (63 º 30 ΄N, 54 º 25 ΄W), at 582 fathoms (ca. 1.06 km). Hosts. Unknown. Distribution. Atlantic Ocean (Hansen 1923). Remarks. Hansen (1923) omitted some taxonomically important appendages, such as the mandible and fifth legs (the latter lost in the type specimen), in his description of A. intermedius. Unfortunately, this species has not been recorded again, and only the antennule and antenna could be observed in the damaged, dissected holotype. Our observations of the pre-oral appendages differed from the original description as follows: 1) the antennule, despite being cleanly broken in half in the holotype, consists of 21 rather than 20 free segments; and 2) the endopod of the antenna is comprised of 3 instead of 2 segments. Despite these amendations, a detailed redescription of this species is still badly needed. Contrary to the above species, A. intermedius can be easily differentiated from its congeners. For instance, A. intermedius, along with the following 19 congeners, possess a 21 -segmented antennule in females: A. astroidicola Conradi, Bandera & López-González, 2006; A. bacescui (Marcus, 1965); A. echinicola (Norman, 1868); A. ellisi Hamond, 1968; A. flustrae Ivanenko & Smurov, 1997; A. hirsutus Bandera, Conradi & López- González, 2005; A. jeanyeatmanae Yeatman, 1970; A. lilljeborgi (Boeck, 1859); A. lunatus Johnsson, 1998; A. madeirensis Bandera, Conradi & López-González, 2007; A. minutus (Claus, 1889); A. reginae Boxshall & Huys, 1994; A. simulans (T. Scott, 1898); A. suberitis Giesbrecht, 1897; A. tenerus (Hansen, 1923) (redescribed below as possessing a 21 -segmented antennule in female); A. tenuicornis Brady, 1910; A. uncinatus (Kritchagin, 1873); A. urabensis Kim, 2004; and A. violaceus (Claus, 1889). Among ... |
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