Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology 15los, penis] (ARTHRO: Insecta) In Protura, the distal part ofthe periphallus, sometimes retractable into basiperiphallus.acrophilous a. [Gr. akros, tip; philein, to love] Preferring regionsof high altitude.acrorhagus n.; pl. -gi [Gr. akros, tip; rhax, berry] (CNID: Anthozoa)A marginal tubercle of sea anemones containingspecialized nematocysts.acroscopic a. [Gr. akros, tip; skopein, to view] Looking towardsthe apex. see basiscopic.acrosome n. [Gr. akros, tip; soma, body] A cap-like structureinvesting the front part of the sperm head allowing penetrationof the cover of the egg cell; formed from Golgi material.acrosternite n. [Gr. akros, tip; sternon, chest] (ARTHRO: Insecta)That part of the narrow marginal flange anterior tothe antecosta of a definitive sternal plate, including thepreceding primary intersegmental sclerotization; normallyfound on abdominal sterna, but absent on thoracic sterna.acrostical see acrostichal area, bristles, scalesacrostichal area (ARTHRO: Insecta) In Diptera, the medianlongitudinal area of the scutum between the anterior promontoryand prescutellar area, bearing bristles or scales.acrostichal bristles (ARTHRO: Insecta) In Diptera, setae occurringin a median longitudinal row on the acrostichal areaof the scutum.acrostichal hairs/seta/setulae see acrostichal bristlesacrostichal scales (ARTHRO: Insecta) In Diptera, scales occurringin one or two lines on the acrostichal area.acrosyndesis n. [Gr. akros, tip; syndesai, to bind together]Incomplete end-to-end pairing of two chromosomes duringmeiosis; telosyndesis.acrotergite n. [Gr. akros, tip; L. tergum, back] (ARTHRO: Insecta)The anterior precostal part of the tergal plate of asecondary segment usually in the form of a narrow flange,varying in size or sometimes obliterated.