Pacific Science Volume 21, Number 2, 1967

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Pacific Science is a quarterly publication devoted to the biological and physical sciences of the Pacific Region.


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    Soil-Vegetation Relationships in Hawaiian Kipukas
    (University of Hawai'i Press, 1967-04) Mueller-Dombois, D. ; Lamoureux, C.H.
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    The Planktonic Shrimp, Lucifer chacei sp. nov., (Sergestidae: Luciferinae), the Pacific Twin of the Atlantic Lucifer faxoni
    (University of Hawai'i Press, 1967-04) Bowman, Thomas E.
    Lucifer chacei sp. nov., closely related to the Atlantic L. faxoni and identified as the latter species by previous authors, is described and compared with L. faxoni. It is widely distributed in the tropical Pacific, and like L. faxoni inhabits coastal waters.
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    Observations on the Biology of the Lousefish, Phtheirichthys lineatus (Menzies)
    (University of Hawai'i Press, 1967-04) Strasburg, Donald W.
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    Chromosomes of Some Opisthobranchiate Mollusks from Eniwetok Atoll, Western Pacific
    (University of Hawai'i Press, 1967-04) Burch, J.B. ; Natarajan, R.
    Chromosome numbers are reported for nine species of opisthobranchiate mollusks from Eniwetok Atoll, Marshall Islands, western Pacific. In the Nudibranchia, both Dendrodoris nigra (Dendrodorididae) and Herviella mietta (Favorinida e) were found to have 13 bivalents during male meiosis. In the Anaspidea, Dolabrifera dolabrifera and Stylocheilus longicauda (Aplysiidae) both had 17 bivalents during male meiosis. In the Cephalaspidea, Haminoea linda and H. musetta (Atyidae) each had 17 pairs of chromosomes during male meiosis and Lathophthalmus smaragdinus and Smaragdinella calyculata (Smaragdinellidae) had 18 pairs. In the Soleolifera, Onchidella evelinae had 18 bivalents during male meiosis. The extreme conservativeness of chromosome numbers in opisthobranchiate mollusks is demonstrated by that fact that all 18 nudibranchs from 10 families studied so far have the single haploid chromosome number 13, and that 18 of the 21 species of the orders Entomotaeniata, Anaspidea, Cephalaspidea, and Sacoglossa have 17 pairs of chromosomes. The haploid number 18 is here reported for the first time for nonsoleoliferan opisthobranchiate mollusks. The more advanced, mostly fresh-water, order Basommatophora, in which the haploid number 18 is the basic number, may well have been derived from a taxon within or related to this cephalaspid superfamily (Philinacea).
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    The Systematics of the Prickly Sculpin, Cottus asper Richardson, a Polytypic Species: Part I. Synonymy, Nomenclatural History, and Distribution
    (University of Hawai'i Press, 1967-04) Krejsa, Richard J.
    The prickly sculpin, Cottus asper, is a geographically widespread, polytypic species characteristically represented by very prickly, nonmigratory, freshwater spawning " inland" forms, and less prickly, catadromous, brackish-water spawning "coastal" forms. Part I , the first contri bution in a series on the systematics of this species, presents a synonymy complete for the period 1836-1936, with a resume of the most important citations from 1936 to 1965. A nomenclatural history of the species is given. The distributional range is listed and also presented in illustration.
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    A New Siphonophora, Vogtia kuruae n. sp.
    (University of Hawai'i Press, 1967-04) Alvarino, Angeles
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    The Growth of Arachnoides placenta (L.) (Echinoidea)
    (University of Hawai'i Press, 1967-04) Hines, Judith ; Kenny, Ron
    Arachnoides placenta (L.) increases in diameter 7 mm during the first year, 4 mm during the second year, and 4 mm in the third year after metamorphosis. The relationship between diameter and weight of the test is approximately of cubic form. The spawning period in north Queensland probably is June to July, and the time of metamorphosis probably September. The growth characteristics are compared with other echinoid species.
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    On Some Gastrocotyline (Monogenoidean) Parasites of Indian Clupeoid Fishes, Including Three New Genera
    (University of Hawai'i Press, 1967-04) Unnithan, R.V.
    Seven species of monogenetic trematodes, including the two genotypes, Engraulicola forcepopenis George, 1961 and Engrauliscobina thrissocles (Tripathi, 1959), are recorded. All seven of these atypical gastrocotylines belong to the subfamily Gastrocotylinae s.s. and are parasitic on clupeoid fishes. Four species in the present collection, viz., Engraulicola microph aryngella sp. n., Engraulixenus malabaricus gen. et sp. n., Engrauliphila grex gen. et sp. n., and Engrauliscobina triaptella sp. n., were collected from fishes of the family Engraulidae, while an entirely new type, Pellonicola elongata gen. et sp. n., was obtained from Clupeidae. The tendency to unilateral inhibition of the clamp rows is incomplete in all these atypical gastrocotylines, and all are characterised primarily by their clamp structure. Diagnostic characters, with special reference to the haptor (its adhesive units or clamps and anchors), the male terminalia, vaginal complex, and other salient features which appear to be taxonomically important, are given for each species.
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