. Bollettino della United States Geological e indagine geografica dei territori. La geologia. 160 bollettino United States Geological Survey. ARACHNTDA. È emastoma troglodytes^ n. sp., (Fig. 5, ingrandito*), 10 ? .-Corpo piuttosto lunghi e sottili comj)ared con la Comunità europea N. dentipaJpis Koch, quest'ultimo essendo breve e di forma ovale, mentre i nostri spe- cies viene contratta alla base dell'addome. L'occhio-il tubercolo è piuttosto grande e prominente; occhi stessi ben sviluppato, nero in re- cently-moulted esemplari, ma in altri scarsamente distinguibile dal marrone scuro, finemente- shagreeued tegumento.

• Collaboratore: Book Worm / Alamy Foto Stock
• ID dell’immagine: RGDCMP
• Dimensioni dei file: 7,1 MB (218,6 KB Download compresso)
• Liberatorie: Modello - no | Proprietà - no
• Dimensioni: 912 x 2740 px | 7,7 x 23,2 cm | 3 x 9,1 inches | 300dpi

Altre informazioni

Questa foto è un'immagine di pubblico dominio, il che significa che il copyright è scaduto o che il titolare del copyright ha rinunciato a tale diritto. Alamy addebita un costo per l'accesso alla copia ad alta risoluzione dell'immagine.

Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.

. Bulletin of the United States Geological and Geographical Survey of the Territories. Geology. 160 BULLETIN UNITED STATES GEOLOGICAL SURVEY. ARACHNTDA. Is emastoma troglodytes^ n. sp., (Fig. 5, enlarged*), 10 ? .—Body rather long and slender comj)ared with the European N. dentipaJpis Koch, the latter being short and ovate, while our spe- cies is contracted at the base of the abdomen. The eye-tubercle is rather large and prominent; the eyes themselves well developed, black in re- cently-moulted specimens, but in others scarcely distinguishable from the dark-brown, finely- shagreeued tegument. Behind the eyes the body contracts dorsally as well as laterally. On the front edge of the cephalothorax is an acute median spine. The six basal abdominal joints are coalesced, forming a single piece, segments 3-6 being indicated by a pair of somewhat trans- verse, high, well-marked tubercles (not forming true spines as in JS^. dentipalpis). The four ter- minal segments are free; the terminal one sub- triangular, one-fourth shorter than wide. Be- neath are seven well-marked sterna, with lunate, dark spiracles on the sternum of the second seg- ment. Mandibles hairy, with the basal joint not so long as broad; second joint of the same width throughout, not swollen toward the end; third joint bent downward and inward at right angles, the hand directed a little outward. Maxillary palpi very long and slender, hairy, nearly twice as long as the body, while in the Euro- pean dentipaJpis they are scarcely half as long in proportion; 6-jointed (m dentipalpis 5-jointed), the basal joint subtriangu- iar in outline, owing to the upper edge being dilated; second a little longer and much slenderer than first, and slightly curved; third a little more than twice as long as the second, very slender; fourth a little shorter than third; fifth, three-fourths shorter than fourth; and sixth slightly shorter than the second, rounded at the end, being cylindrical, ovate, and unarmed, though with rath

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1870
• booksubjectgeology
• bookyear1874